Man, I really love this. The story was beautiful, as was the art style. I'm a sucker for narrative games, this is why I started with the story while creating my game.
I think the only problem I had was that you can't understand what was a platform and what was not. You could have made the platforms a different color so you can actually see them, but still be integrated into the background.
Also you could add elements that would block your path and you need to go backward to despawn them temporally so you can go further. But it could affect the narrative so I kinda understand why you wouldn't want that.